Are cheap fitness trackers accurate?

For steps and resting heart rate — yes, within 5-10%. For exercise heart rate — less accurate than a chest strap. For sleep stages — reasonable estimates but not medical-grade. Calorie burn estimates are the least accurate metric on any tracker.

Do I need to charge my fitness tracker daily?

No. Every tracker on this list lasts 10-18 days per charge. You charge once every 1-2 weeks. Most charge from 0 to 100% in about 2 hours.

Best Fitness Trackers Under $50 in 2026